from nbc news, at the police staging area. do you have a sense how confident police are that this suspect has been restricted to that area? >> it may well be the case. several hours ago, we saw convoys of military vehicles, buses of police and motorcycles and other armed law enforcement officers. all congregating in the staging area behind me across from the mall in a parking lot. it looked like they were preparing for some sort of confrontation if not an assault. there were a lot of sirens going on. that activity seems to have abat abated. they think they know where the suspect is. clearly there was a pretty good sense here watching this that they seemed to be preparing for what could be a very violent confrontation with the suspect or suspects. shortly about a couple of hours ago now, governor patrick came out and we were told that the entire city of boston was under lockdown. that seemed to escalate the concerns. we don't know right now as we have been told, they believe they have the suspect cornered in an area and the sec